Coated structure with a monitoring system, a monitoring system, and a method for monitoring a condition of a coated structure

A coated structure with a monitoring system, the structure comprising a base having a base surface, a coating joined to the base surface in a base interface and extending in a thickness direction to an outer coating surface, a sensor comprising at least one electrode embedded in the coating, an I/O device configured to generate an input signal in the sensor and to read an output signal from the sensor, a data logger configured to log the output signal from the I/O device, and a computer unit configured to use the logged signal from the data logger. To provide improved information related to the condition of the structure or coating, the computer unit is configured to determine at least two separate indexes, each index related to a property of the coating or the structure.